When did the Kingdom of Sussex exist?

The Kingdom of Sussex existed 477 – 9th century. On this map it is drawn AD 490–691, 718–771.

How large was the Kingdom of Sussex?

At its greatest extent drawn on this map, the Kingdom of Sussex covered about 5,000 km². That is the largest area the border data gives it across the years it is drawn, not necessarily its greatest extent in history.

Europe · The migration period

Kingdom of Sussex

477 – 9th century

The Kingdom of Sussex (the South Saxons, Sūþseaxe) occupied the coastal region between the Weald and the Channel (modern Sussex). Per the Anglo-Saxon Chronicle, it was founded in 477 when Ælle landed with his three sons (Cymen, Wlencing, and Cissa) at Cymenshore, fighting the native Britons; the Chronicle records his capture of the Saxon Shore fort of Anderitum (Pevensey) in 491, with the slaughter of its British defenders.

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Existed: 477 – 9th century
Shown on the map: AD 490–691, 718–771 (2 periods)
Peak area: 5k km²
Region: Europe

Overview

History

Bede names Ælle as the **first king to hold imperium (bretwalda)** over the other Anglo-Saxon kingdoms south of the Humber — the earliest overlord in his famous list — though Sussex itself was never a major power and Ælle's wider hegemony is shadowy. The kingdom was relatively isolated, cut off inland by the great forest of the Weald.

Decline and legacy

Sussex has the distinction of being the last of the major Anglo-Saxon kingdoms to be converted to Christianity: its people remained largely pagan until Saint Wilfrid evangelised them in the 680s (during his exile, c. 681), under King Æthelwealh — the latest major conversion in England, later than the rest by decades. Æthelwealh had been baptised earlier under Mercian sponsorship. Sussex fell under Mercian and then West Saxon overlordship and was absorbed into Wessex in the early 9th century (by the reign of Ecgberht). Its early history is poorly documented, resting heavily on the sparse and sometimes legendary Chronicle entries.

Common questions

What was the Kingdom of Sussex?: The Kingdom of Sussex (the South Saxons, Sūþseaxe) occupied the coastal region between the Weald and the Channel (modern Sussex). Per the Anglo-Saxon Chronicle, it was founded in 477 when Ælle landed with his three sons (Cymen, Wlencing, and Cissa) at Cymenshore, fighting the native Britons; the Chronicle records his capture of the Saxon Shore fort of Anderitum (Pevensey) in 491, with the slaughter of its British defenders.
When did the Kingdom of Sussex exist?: The Kingdom of Sussex existed 477 – 9th century. On this map it is drawn AD 490–691, 718–771.
How large was the Kingdom of Sussex?: At its greatest extent drawn on this map, the Kingdom of Sussex covered about 5,000 km². That is the largest area the border data gives it across the years it is drawn, not necessarily its greatest extent in history.
Who ruled the Kingdom of Sussex?: Bede names Ælle as the **first king to hold imperium (bretwalda)** over the other Anglo-Saxon kingdoms south of the Humber — the earliest overlord in his famous list — though Sussex itself was never a major power and Ælle's wider hegemony is shadowy. The kingdom was relatively isolated, cut off inland by the great forest of the Weald.
How did the Kingdom of Sussex end?: Sussex has the distinction of being the last of the major Anglo-Saxon kingdoms to be converted to Christianity: its people remained largely pagan until Saint Wilfrid evangelised them in the 680s (during his exile, c. 681), under King Æthelwealh — the latest major conversion in England, later than the rest by decades. Æthelwealh had been baptised earlier under Mercian sponsorship.

Sources

This compendium cites its sources once for the whole document rather than per territory. Its bibliography names the English Wikipedia articles for each territory and its key figures as the primary basis, with Encyclopædia Britannica, the World History Encyclopedia, and academic and primary sources — Jordanes, Procopius, Gregory of Tours, Bede, Ammianus and the Anglo-Saxon Chronicle, read through the secondary literature. The article this entry is anchored on:

Wikipedia — Kingdom of Sussex en.wikipedia.org/wiki/Kingdom_of_Sussex

This entry was last updated 27 September 2026.

This entry was researched and drafted with AI from the sources above, and has not been reviewed by a historian. How entries are made

Text available under CC BY-SA 4.0: reuse it with a credit to The World Through Time and a link to this page. Passages drawing on the Wikipedia articles listed above are also licensed CC BY-SA 4.0 by their contributors.

Border geometry for the map itself comes from Cliopatria v0.12 (Seshat Global History Databank, CC-BY-4.0).

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